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Systematic name Triphenylarsine
Other names Triphenylarsane
Molecular formula C18H15As
Molar mass 306.23 g/mol
Appearance colorless solid
CAS number [603-32-7]
Density and phase 1.395 g/cm3
Solubility in water insoluble
Other solvents benzene, methylene chloride
Melting point 61 °C
Crystal structure triclinic
Dipole moment  ? D
MSDS External MSDS
Main hazards toxic
NFPA 704
Flash point  ? °C
R/S statement R: 23/25-50/53
S: 20/21-28-45-60-61
RTECS number CH8942500
Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Related compounds Triphenylphosphine
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Triphenylarsine is the chemical compound with the formula As(C6H5)3. This organoarsenic compound, often abbreviated AsPh3, is a colorless crystalline solid that is used as a ligand and a reagent in coordination chemistry and organic synthesis. The molecule is pyramidal with As-C distances of 1.942-1.956 Å and C-As-C angles of 99.6-100.5°.[1]

This compound is prepared by the reaction of arsenic trichloride with chlorobenzene using sodium as the reducing agent:[2]

AsCl3 + 3 PhCl + 6 Na → AsPh3 + 6 NaCl


AsPh3 is the precursor to tetraphenylarsonium chloride, [AsPh4]Cl, a popular precipitating agent.[2]

AsPh3 forms complexes with low valent metals that are analogous to the corresponding triphenylphosphine derivatives, such as IrCl(CO)(AsPh3)2 and RhCl(AsPh3)3.


  1. ^ Mazhar-ul-Haque, Hasan A. Tayim, Jamil Ahmed, and William Horne "Crystal and molecular structure of triphenylarsine" Journal of Chemical Crystallography Volume 15, Number 6 / 1985. DOI 10.1007/BF01164771
  2. ^ a b Shriner, R. L.; Wolf, C. N. "Tetraphenylarsonium Chloride Hydrochloride” Organic Syntheses, Collected Volume 4, page 910, 1963.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Triphenylarsine". A list of authors is available in Wikipedia.
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